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I hate to say this, but I doubt the radio or battery has much to do with it.
This is just a wild guess, but I would suggest you get a voltmeter and check the alternator output.
It should be 12.5 at idle, but over 13.5 when reved up.
If the radio is weak output, it seems to me it is getting less then 12 volts input, or else it had blown internals.
Another possibility is that a door speaker wire may be shorting and draining radio power.
Hard to guess.

if you dont get even a pop or crack when turned on at first, check the radios memory on the read-out on the radio face and see if its on mute setting, and if this is not the case, there are 2 fuses,one controls memory power and the other controls audio output power, check both as if one fuse is out the other cant make the radio operate properly